. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. (ILANDS CONNECTED WITH THE INTESTINAL CANAL. 295. so marks off a more or less well-marked fourth lobe. The anterior portion of the left lobe is attached to the corresponding portion of the rig-ht lobe by a narrow commissure. The median lobe (X^) es- p- ^ tends backwards as far as the pylorus, and covers the com- mencement of the intestine together with the pancreas ; these organs can, therefore, not be seen until this lobe is displaced. A fifth lobe is sometimes found on the dorsal surface of the median lobe, and to it or to t
. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. (ILANDS CONNECTED WITH THE INTESTINAL CANAL. 295. so marks off a more or less well-marked fourth lobe. The anterior portion of the left lobe is attached to the corresponding portion of the rig-ht lobe by a narrow commissure. The median lobe (X^) es- p- ^ tends backwards as far as the pylorus, and covers the com- mencement of the intestine together with the pancreas ; these organs can, therefore, not be seen until this lobe is displaced. A fifth lobe is sometimes found on the dorsal surface of the median lobe, and to it or to the dorsal sur- face of the median lobe the small intestine is attached by the Ligamentttm hepato-duode- nale (Fig. 195 Lhp). The Vena ]}ortarnm enters the liver behind this ligament. The right lobe extends much further dorsalwards than the left lobe, and even comes in contact with the lung, the vessels of which sometimes indent its surface in spirit specimens. This lobe is also in contact with the base of the fat-body, and in females with the oviduct. By drawing the lobes of the liver to either side and displacing the heart towards the head, the posterior caval vein is seen passing from the liver to the heart, and the hepatic commissure joining the lateral lobes is brought into view. (2) The gall-bladder (Fig. 195 6) is placed on the dorsal surface of the liver in the deep niche between the right and left lobes ; it is attached to the liver by connective-tissu^ and peritoneum. The gall-bladder is round or oval in form ; when moderately full it has a smooth, outer wall, which is thin and allows the green colour of the bile to be seen. It possesses a duct {l)cy), the cystic duct [I)i(chis c7/sticus), which bifurcates near its origin. The two cystic ducts (Fig. 195 Bc^) join the larger hepatic ducts, as shown in the figure, and so form a simple anas- The liver, seen from the ventral siirface. Du Duodenum. // Heart. L Left lobe of liver. Zl Right lobe of liver. i2 Middle lobe of li
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